[Patch, Fortran] PR51055 - accept non-spec-expr "i" in allocate(character(len=i)::s)

[Tobias Burnus]

A rather simple patch.

Build and regtested on x86-64-linux.
OK for the trunk?

I think that is the last patch required for commonly used  code. 
Remaining are issues with array constructors and concatenations - and, 
of course, deferred-length components.

Tobias
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